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All Journal Rotasi Jurnal Teknik ITS Dinamika Teknik Mesin Journal of Science and Applicative Technology Journal of Renewable Energy and Mechanics
Devia Gahana Cindi Alfian
Department Of Mechanical Engineering, Institut Teknologi Sumatera, Jalan Terusan Ryacudu, Desa Way Hui, Kecamatan Jatiagung, Lampung Selatan, Indonesia 35365
Automotive Engineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Re-design High Pressure Heater (HPH) 5 pada Perusahaan Pembangkit Tenaga Listrik Devia Gahana Cindi Alfian; Djatmiko Ichsani
Jurnal Teknik ITS Vol 2, No 2 (2013)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (395.877 KB) | DOI: 10.12962/j23373539.v2i2.4466

Abstract

Boiler merupakan komponen utama yang ada pada pembangkit. Jika terjadi penurunan efisiensi pada boiler, maka listrik yang dihasilkan juga menurun. Berbagai cara  dilakukan untuk meningkatkan efisiensi dari boiler, salah satunya adalah menggunakan High Pressure Heater (HPH). HPH merupakan alat pemanas feedwater sebelum masuk ke boiler sehingga mengurangi kerja dari boiler. Saat ini kondisi HPH 5 yang ada di salah satu perusahaan pembangkit listrik sudah lama digunakan sehingga perlu dilakukan analisa untuk mengatahui performa dari HPH ini. Jika terjadi kebocoran atau kerusakan hanya dilakukan re-tubing yang selalu menggunakan design Original Equipment Manufacturing (OEM) yang memakan waktu cukup lama dan biaya yang mahal. Proses analisa yang dimaksudkan adalah re-design sehingga apabila terjadi kerusakan dapat diganti dengan buatan sendiri. Pada perancangannya digunakan analisa termodinamika dan perpindahan panas dengan metode LMTD untuk mendapatkan dimensi tiap zona. Perhitungan yang dilakukan meliputi menentukan panjang masing-masing tiap zona HPH, laju perpindahan panas, overall heat transfer coefficient (U), luas perpindahan panas (A), perhitungan pressure drop (∆p) untuk masing-masing zona. Hasil yang didapatkan pada analisa ini adalah dimensi zona desuperheating didapatkan panjang maksimal 2,94 m, luasan perpindahan panas efektif 231,7 m2, Overall Heat Transfer Coefficient 520,43 Watt/m2K, baffle spacing 0,345 m, jumlah baffle 8 buah. Pada zona Condensing didapatkan panjang maksimal 9,39 m, luasan perpindahan panas efektif 739,5 m2, Overall Heat Transfer Coefficient 3738,3 Watt/m2K, baffle spacing 1,8 m, jumlah baffle 4 buah. Sedangkan pada zona Subcooling didapatkan panjang maksimal 1,66 m, luasan perpindahan panas efektif 131 m2, Overall Heat Transfer Coefficient 3659,84 Watt/m2K, baffle spacing 0,345 m, jumlah baffle 4 buah. Sehingga didapatkan panjang total tube 14 m, total luasan perpindahan panas efektif  1.102,34 m2, Total Overall Heat Transfer Coefficient 733 Watt/m2K, total  jumlah baffle 17 buah.
Performance of Four Step Engine Generator Set with Oxy-Hydrogen (HHO) Fuel from Water Electrolysis Process Using Vacuum Valve Carburator Theodorus Rendy Prasetya; Lathifa Putri Afisna; Devia G.C. Alfian; Rizky Faesal Sadikin
Journal of Renewable Energy and Mechanics Vol. 5 No. 02 (2022): REM VOL 5 NO 02 2022
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.144 KB) | DOI: 10.25299/rem.2022.vol5.no02.10058

Abstract

Alternative energy sources are required to lessen the environmental impact brought on by the usage of fossil fuels as a result of rising energy demand and rising fossil fuel use. One of the fuels that can be utilized to power generator sets is oxy-hydrogen gas. Oxy-hydrogen gas can be obtained from the electrolysis of water using environmentally friendly energy sources. This study aims to determine the effect of the use of oxy-hydrogen gas from the electrolysis of water as an alternative fuel, to find the performance parameters of the generator set engine using oxy-hydrogen fuel, to compare the performance of the generator set engine with oxy-hydrogen gas fuel with other fuels like pertalite fuel and a mixture of oxy-hydrogen gas and pertalite. The study used a 4 stroke gasoline engine generator set mounted with a vacuum valve type carburetor with a load of 1000 watts which is commonly used. From the results of the study, the performance parameters of the generator set were obtained using oxy-hydrogen fuel. The parameter value when the load is 1000 watts, the effective power of the generator is 1.035 kW, the torque value at 3.297 Nm, specific fuel consumption is 0.3658 kg/kW.hour, the thermal efficiency value is 12.05% and the average effective pressure value is 184.06 kPa.
Heat Transfer Characteristics of Hybrid Nanofluids Al2O3/ZnO as Working Fluid in Electronic Cooling Systems Devia Gahana Cindi Alfian
ROTASI Vol 24, No 4 (2022): VOLUME 24, NOMOR 4, OKTOBER 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.4.65-71

Abstract

The use of nanofluid as a working fluid to improve equipment performance has been growing recently. Utilization of nanofluid hybrids is the development of mono nanofluid to improve heat transfer performance which is still not maximized when using mono nanofluid. This research was conducted to determine the performance of hybrid nanofluids with composition of Al2O3/ZnO-Distilled Water as working fluids in electronic devices. The process of making hybrid nanofluids was carried out using a two-step method using an ultrasonic cleaner for 3 hours. Furthermore, the test was carried out by varying the ratio of Al2O3 and ZnO nanoparticles at 25%:75%, 50%:50%, 75%:25% at exactly 0.5% volume fraction. Based on the test results, adding nanoparticles can increase the heat transfer in the working fluid. The use of nanofluid hybrids at varying ratios of Al2O3:ZnO (50%:50%) with a flow rate of 0.7 L/min has the highest heat transfer coefficient value of 220.14 W/m2.oC at Reynolds Number 178.4 and requires pumping power of 0.649 W. Moreover, distilled water with a flow rate of 0.7 L/min has the heat transfer coefficient of 77.48 W/m2.oC at Reynolds Number 130.1 and requires a pump power of 0.425 W.
Uji Performa Gasoline Engine menggunakan bioaditif cengkeh dengan bensin berkadar oktan 90 Devia Gahana Cindi Alfian; Rico Aditia Prahmana; Dicky J. Silitonga; Abdul Muhyi; Didik Supriyadi
Journal of Science and Applicative Technology Vol 4 No 1 (2020): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (542.971 KB) | DOI: 10.35472/jsat.v4i1.243

Abstract

Globally, the demand for fuels is ever-increasing and so is the demand for fuel additives. A fuel additive is a substance added in small quantities to increase the performance of the engine, decrease fuel consumption and reduce emission. The fuel additives have no specific set of raw materials or ingredients. Every fuel additive is different from the other in many ways of raw materials and ingredients to produce these additives. In many cases, fuel additives have made by chemical materials as additives for a gasoline engine. However, the optimal parameters for the reduction of fuel consumption are not clear. Accordingly, the present study performs a mixing additive material in the form of clove oil with pure gasoline fuel with a percentage of 1%, 0,6% and 0,3% from a total volume of gasoline to be tested. Then the mixing of the additive and gasoline is tested into the gasoline engine by varying the load using 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800 and 2000 Watt power with a fixed engine rotation of 2500 rpm. The results show that the reduction of fuel consumption respectively. Results showed that the addition of 1%, 0.6% and 0.3% clove oil into a 90 octane gasoline reduced fuel consumption by 10.6%, 18.2% and 15.4% respectively. Maximum reduction of fuel consumption was 28.6% at 800 W electrical load with 0.6% of clove oil additive.
Optimasi Multi Respon pada Proses End-Milling Glass Fiber Reinforced Polymer (GFRP) Dengan Menggunakan Metode Back Propagation Neural Network – Particle Swarm Optimization (BPNN-PSO) Fajar Perdana Nurullah; Abdul Muhyi; Devia Gahana Cindi Alfian
Journal of Science and Applicative Technology Vol 5 No 2 (2021): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i2.447

Abstract

The use of composite materials continues to show an increasing trend in various fields such as sports, aviation and the military. This also increases the need for knowledge about the manufacturing process of composites. One of the most widely used composite materials is glass fiber reinforced polymer (GFRP). In the process of making components made from GFRP, one of the processes that is often used is end-milling. The studies that have been carried out on the GFRP end-milling process mostly use woven fibers, while research on machining of GFRP using combo fibers has not been widely conducted. This research was conducted to determine the effect of spindle speed, feeding speed, and cutting depth, on cutting forces, surface roughness, and delamination. In addition, multi response optimization is carried out using the combined method of BPNN-PSO to obtain the most optimal combination of machining parameters. The results shows that the optimal level of cut depth, spindle speed, and feeding speed are 1 mm, 4871 rpm and 788 mm / minute, respectively.
Pengaruh Komposisi Campuran Minyak Sereh Wangi dan Minyak Cengkeh terhadap Unjuk Kerja Mesin Diesel Rico Aditia Prahmana; Devia Gahana Cindi Alfian; Didik Supriyadi; Dicky Januarizky Silitonga; Abdul Muhyi
Journal of Science and Applicative Technology Vol 4 No 2 (2020): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v4i2.244

Abstract

The increase in fuel prices makes the use of essential oils as a natural bio-additive in diesel engines much in demand. This is because essential oils are believed to have good content to improve engine performance and reduce fuel consumption. In this research, essential oils used are citronella oil because they contain carboxylic compounds (-COOH) and clove oil which has the advantage to prevent corrosion. The aim is to improve engine performance and reduce fuel consumption can also prevent corrosion. This research was conducted by mixing citronella oil and clove oil with diesel fuel with a percentage of 1%, 0.5%, and 0.1% of the total volume. The diesel engine is operated with a loading variation of 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, and 2000 W at a constant engine speed of 1500 rpm. The variables measured and calculated in this experiment are power, torque, Brake Mean Effective Pressure (BMEP), Specific Fuel Consumption (SFC). The results showed that the addition of citronella oil and clove oil to diesel fuel with a percentage of 0.1%, 0.5%, and 1% significantly reduced fuel consumption by 14.6%, 12.9%, and 18.3%, respectively. The maximum fuel reduction from mixed oils is only 0.086 liters/hour at 1000W loads with 1% bio-additives content.
ANALISIS KINERJA HIGH PRESSURE HEATER (HPH) TIPE SHELL AND TUBE HEAT EXCHANGER Devia Gahana
Journal of Science and Applicative Technology Vol 2 No 2 (2018): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (432.243 KB) | DOI: 10.35472/281416

Abstract

Heat exchanger is one of the supporting production equipment that move the heat energy from one of fluid to another fluid flow. One example of a heat exchanger in power plant industry is High Pressure Heater (HPH). HPH is high pressure feedwater heater that using hot steam turbine waste product used as heating medium before entering the economizer on boiler to reduce the work of boiler. This research was conducted to determine the effective efficiency of High Pressure Heater at Power Plant Industry. This efficiency determination is based on thermodynamics and heat transfer analysis with Log Mean Temperature Difference (LMTD) method and Number of Transfer Unit (NTU) method. The analysis is to determining the effective heat transfer, overall heat transfer coefficient (U), Effectiveness and the analysis of pressure drop (∆P). The analysis results obtained the efffective heat transfer of 37.013 kW, overall heat transfer coefficient (U) of 502,48, effectiveness of 0,47 and the number of pressure drop of 23.498,06 Pa.
Aplikasi Penggunaan Serah Wangi Sebagai Bioaditif Alami untuk Karakterasi Unjuk Kerja dari Mesin Diesel Abdul Muhyi; Rico Aditia Prahmana; Devia G. C. Alfian; Dicky J. Silitonga; Didik Supriyadi
Journal of Science and Applicative Technology Vol 3 No 1 (2019): Journal of Science and Applicative Technology August Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1188.007 KB) | DOI: 10.35472/jsat.v3i1.194

Abstract

The consumption of diesel fuel in Indonesia is increasing every year, one way to overcome this problem is to use natural bioaditive in the form of essential oils found in Indonesia. Essential oils used in this study are fragrant lemongrass because fragrant lemongrass contains carboxylic compounds (-COOH) [1,2,3]. With the aim of improving engine performance and reducing fuel consumption. This research was conducted by mixing fragrant citronella oil with diesel oil with a percentage of 1%, 0.5% and 0.1% of the total volume. Diesel engines are operated with variations in loading 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800 and 2000 W at a constant engine speed of 1500 rpm. The variables measured and calculated in this experiment are power, torque, Break Mean Effective Pressure (BMEP), Specific Fuel Consumption (SFC). The results showed that adding citronella oil to diesel fuel with a percentage of 1%, 0.5% and 0.1% significantly reduced fuel consumption by 15.5%, 3.6% and 2.6% respectively. The maximum reduction in fuel consumption reaches 0.055 liters / hour at 200W loading with a bioaditive level of 0.1%. The next study planned is to mix clove oil and citronella oil as bioaditive so that it is expected to reduce fuel consumption and engine corrosion. Keywords: Diesel engine, bioaditive, fragrant citronella oil, performance of diesel engines, fuel consumption
ANALISIS POTENSI ENERGI DAN PENGURANGAN EMISI CO2 DENGAN PENGELOLAAN LIMBAH PETERNAKAN SAPI RAKYAT DI KECAMATAN JATI AGUNG KABUPATEN LAMPUNG SELATAN Rinda Gusvita; Dian Fajarika; Mika Margareta; Devia Gahana CA
Journal of Science and Applicative Technology Vol 1 No 2 (2017): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (170.149 KB) | DOI: 10.35472/281424

Abstract

Management of feedlot manure is becoming a larger responsibility as more regulations are imposed to protect water, both surface and groundwater, from manure contamination. Instead of using the manure for compost, feedlot owners can capture methane from the decomposing manure (and turn that into electricity or heat), or use the waste to produce liquid fuel. Biogas may also be called renewable natural gas because biogas can be used as a fuel source to produce electricity and heat like natural gas.This research converting energy generated from the measurement of total waste theoretically to be convert to electricity generated from the waste. Within the number of 19,398 total cows in Jati Agung Sub District husbandry has the potential to produce electric energy of 149,365.376 kwh per day or 15,836.79 mwh per year. The conversion from waste to electricity will reduce the number of total emission of 64,086.7464 tCO2 per year.
Wear evaluation of palm oil and SAE 15W 40 engine lubricants with a ball-on-disk tester based on an improvised drilling machine D.G.C. Alfian; D.J. Silitonga; F.M.Al Machzumy; F. Oktaberi; L. Triawan
Dinamika Teknik Mesin Vol 13, No 2 (2023): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v13i2.679

Abstract

This paper introduces a modified ball-on-disk test, utilizing a drilling machine, to investigate the tribological behavior of wear on a plate surface under various lubrication conditions. The tribometer, based on the ball-on-disc principle, employs an improvised bench-top drill press machine. Despite its simplicity, it effectively facilitates wear-track experiments using engine oil (SAE 15W 40) and palm oil as lubricants. Tests are conducted at room temperature, maintaining a constant load at 8.83 N and rotational speed of 180 rpm for 2 minutes per sample. Microscopic analysis of wear scars on the plate samples reveals distinct wear patterns and characteristics for each lubricant, with measurements taken at multiple positions for accuracy. The current work focuses exclusively on wear scar analysis, with findings indicating that engine oil outperforms the counterpart, displaying a smaller wear track width, hence superior lubrication and wear protection capabilities. In contrast, palm oil exhibits a larger wear track, implying limitations in friction reduction and material preservation. This work has demonstrated the practical use of the cost-effective tribometer device for conducting preliminary studies of lubricant wear reduction performance. The test outcomes render valuable insights for lubricant formulators, particularly at the early stage of laboratory-scale development.
Co-Authors Abdul Muhyi Dian Fajarika, Dian Dicky J. Silitonga Didik Supriyadi Djatmiko Ichsani F. Oktaberi F.M.Al Machzumy Fajar Paundra Fajar Perdana Nurullah L. Triawan Lathifa Putri A Lathifa Putri Afisna Marone J Tambunan Mika Margareta Muhammad Syaukani Rico Aditia Prahmana Rinda Gusvita Rizky Faesal Sadikin Theodorus Rendy Prasetya